Tungsten hexachloride
Tungsten hexachloride is the chemical compound with the formula WCl6. This dark violet blue species exists as a volatile solid under standard conditions. It is an important starting reagent in the preparation of tungsten compounds.[1] WCl6 is a rare example of a charge neutral hexachloride, another example being ReCl6. MoCl6 cannot be prepared. Better known than WCl6 is the still more volatile WF6.
As a d0 ion, W(VI) forms diamagnetic derivatives. The hexachloride is octahedral with equivalent W-Cl distances of 2.24 - 2.26 Å.[2] In the WCl6, the chloride ligands are donors in both sigma- and pi senseDoes this refer to MO's?[citation needed]. Methylation with trimethylaluminium affords hexamethyl tungsten. Treatment with butyl lithium affords a reagent that is useful for deoxygenation of epoxides.[3]
The chloride ligands in WCl6 can be replaced by many anionic ligands including Br−, NCS−, and RO− (R = alkyl, aryl).
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